Laravel Validate Twig Template

ValidTwigTemplate.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

use Twig_Environment;
use Twig_Filter;
use Twig_Loader_Array;
use Twig_Error_Syntax;

class ValidTwigTemplate implements Rule
{
    private $_twig_error;

    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $template)
    {
        try {
            $loader = new Twig_Loader_Array(['template' => $template]);
            $twig = new Twig_Environment($loader);
            $twig->render('template', []);
        }
        catch(Twig_Error_Syntax $e)
        {
            $this->_twig_error = $e->getMessage();
            return false;
        }
        catch(Exception $e)
        {
            return false;
        }

        return true;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return $this->_twig_error ?: 'The template has an error.';
    }
}